Condensed Consolidated Statements of Cash Flows - Unaudited (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net cash used in operating activities	$ (19,249)	$ (41,382)
Investing activities:
Purchases of investments	(721)	(2,880)
Proceeds from sale of investments	5,626	4,326
Purchases of property, plant and equipment	(1,975)	(2,374)
Increase in margin deposits	(2,328)	(1,271)
Other investing activities, net		287
Net cash provided by (used in) investing activities	602	(1,912)
Financing activities:
Repayment of debt	(26,521)us-gaap_RepaymentsOfDebt	(19,554)us-gaap_RepaymentsOfDebt
Payment of withholding taxes on exercise of RSU	(21)	(814)
Debt issuance costs	(171)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from debt	30,353us-gaap_ProceedsFromIssuanceOfDebt	18,182us-gaap_ProceedsFromIssuanceOfDebt
Net cash provided by (used in) financing activities	3,640	(2,186)
Effect of exchange rate changes on cash		(151)
Decrease in cash and cash equivalents	(15,007)	(45,631)
Cash and cash equivalents beginning of the period	62,978	138,039
Cash and cash equivalents end of the period	47,971	92,408
Supplemental cash flow information:
Refunds of federal, foreign, and state income taxes	(59)us-gaap_IncomeTaxesPaidNet	(2,108)us-gaap_IncomeTaxesPaidNet
Interest paid, net of amounts capitalized	$ 1,267us-gaap_InterestPaidNet	$ 1,521us-gaap_InterestPaidNet

Payments for Repurchase of Common Stock and Tax Withholding for Share-based Compensation

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For the entity and the disposal group, cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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